However, the actor has revealed the sad news that his cancer has returned and it is inoperable.

The Icelandic star tweeted: ‘It’s not until they tell you you’re going to die soon that you realize how short life is. Time is the most valuable thing in life because it never comes back. And whether you spend it in the arms of a loved one or alone in a prison-cell, life is what you make of it. Dream big.’

It’s not until they tell you you’re going to die soon that you realize how short life is. Time is the most valuable thing in life because it never comes back. And whether you spend it in the arms of a loved one or alone in a prison-cell, life is what you make of it. Dream big.

When someone replied asking if the cancer had returned, Stefan tweeted: ‘Unfortunately it’s back and this time they can’t operate on it. :-(.’

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He later tweeted: ‘Some days we feel very low, some days we are happy and then we are happy about all that we have accomplished together and lived together. Nobody can take that away from us, however this goes. Not even death itself.’

Stefan’s wife Steinunn Ólína Þorsteinsdóttir elaborated on his condition in a public Facebook post.

She wrote: ‘Last Friday we got confirmed after a trip to Köben in Jáeindaskan that there are new metastases in Stefán that can not be removed by surgery. Even though I knew for a long time that this day would come, it’s a difficult turning point. There is no cure for this.

‘Now he will have to undergo chemotherapy to try to prolong his life and we hope that this will go as well is possibly can, to improve how he feels and to prolong his life. The first medication was yesterday.’

After Stefan was diagnosed with cancer in late 2016, LazyTown writer Mark Valenti started a GoFundMe to help Stefan and his family while he was out of work. The campaign raised $169,000.

Stefan starred as Robbie Rotten on LazyTown between 2004 and 2007 and again from 2013 to 2014.

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